Jungle Zone boss

From Sonic Retro

The third boss of Sonic the Hedgehog (8-bit), Jungle Zone's fight with Dr. Ivo Robotnik sees the Egg-O-Matic depositing rolling bombs at Sonic's feet. Taking place on a U-shaped vine platform, Sonic must hop over the black munitions, hitting Eggman when he dips down at the side of the screen to drop a new bomb. The gravest difficulty in this fight tends to arise when Sonic rebounds after hitting Robotnik's module, as it can be hard to avoid landing right in the path (or on top of) one of the bombs.

The bottomless pits off the edge of the vine must be avoided too; it's all too easy to lose a life even after the boss has been defeated, by misjudging the jump off to the right and failing to reach the capsule's platform.